On an algebra quiz, 10 \% of the students scored 70 points, 35 \% scored 80 points, 30 \% scored 90 points, and the rest scored 100 points. What is the difference between the mean and the median of the students’ scores on this quiz?

**Answer Choices**

A. 1

B. 2

C. 3

D. 4

E. 5